A Farmingville mother is accused of snorting heroin at a Wal-Mart with her 3-year-old in tow.

A store guard at Centereach Mall called 911 after seeing a woman sniff something through a straw while pushing her son in a cart Saturday. Police arrested Stacy Roe, 35, after reviewing store surveillance video. Cops say Roe admitted she was doing heroin and also admitted she had some in her wallet.

Roe is charged with endangering the welfare of a child and criminal possession of a controlled substance. She is scheduled to be arraigned July 17 in First District Court in Central Islip. Her son is with his father while Child Protective Services investigates.

AP wire reports contributed to this story.